Liquidproof carton



. Sept. 27, 1932. w. E. J. CROSSBY U LIQUIDPROOF CARTON Filed Oct. 23, 1929 W KC/W555 7 f LINITED STATES Patented Sept. 27, 1932 PATENT OFFICE WILLIAM EDMUND JACOBS CROSSBY, 0F HARROW, ENGLAND, AS SIGNOR 'I'O MONO CONTAINERS LIMITED, OF LONDON, ENGLAND, A REGISTERED COMPANY OF GREAT BRITAIN mournraoor CARTON g Application filed October 23, 1929, Serial No. 401,737, and in Great Britain October 30, 1928.

This invention relates to liquidproof cartons of paper, cardboard and the like and in particular to those adapted to contain milk or other liquids which are to be hermetically sealed. The object of the present invention is to provide an improved carton of the kind comprising a cylindrical or tapered vessel of paper or the like treated to render it waterproof initially open at onepreferably the largerend, the other end being closed by means of an end piece secured to the side walls in any suitable permanent manner.

According to this invention the vessel is constructed to receive, after it has been filled, a cap of paper material having a circumferential flange, hereinafter more fully described, which is inserted into the open end of the vessel so that the flange of the cap is in contact with the inner wall of the container both above and below the plane of the disc portion of the cap. The edge of the vessel is then turned over, crimped or folded so as to form, with the outer end of the flanged cap, a reinforced rim which seals the vessel and constitutes a thickened rim to support the vessel when it is reversed so that the disc portion of the cap lies above the level of the base of the rim.

The cap may comprise two similar cuplike members arranged back to back and secured together, with or without a stiffening disc between them, or a single disc of paper may have a cylindrical flange formed integral therewith and so folded that the inner portion of the flange is of double thickness to extend above the inner surface of the disc, whilst the outer portion of the flangewhich is preferably of single thickness ex tends sufficiently beyond the out-er surface of the disc to enable the end of the container to be folded over it. Ineither case, the cylindrical flange which makes contact with the inner wall of the vessel after insertion therein tends to form a cup leather, the pressure of the liquid on this flange serving to ensure liquid-tight seal between it and the vessel.

To improve the seal between the cap and'the' container, a' heading is preferably formed on the inner wall of the container so as to reduce the effective diameter of the container approximately in the plane of the cap disc, so that when the vessel is reversed and the inner flange-tends to expand like a cup washer, anyv downward movement of the cap-as a whole is prevented.

Various constructions according to this invention are illustrated somewhat diagrammatic'ally in the accompanying drawing, in which Figure 1 is a sectional elevation of a cap formed from two flanged discs arranged back to back, I Figure 2 shows such a disc inserted into the container having an internal shoulder, the righthand side of the figure showing the cap before the container is turned over its outer flange, and the lefthand half of the figure showing the edge turned over,

Figure 3 is a view similar to Figure 2 in which a groove or beading is formed in the container in the plane of the disc,

Figure 4- is a. view similar to Figure 3 in which the cap has acentral reinforcing disc and an outer or downward flange of sufficient depth to en able a double crimp to be ob- ,tained'when theedge of the container is turned over asshown on the lefthand side of .the figure,

Figure 5 is a sectional elevation of a modified construction of cap formedfrom a single sheet of material, and a v Figure 6 shows such a, cap in position, the righth and side of the figure illustrating the cap before. and the lefthand half of the figure'after the edge of the container has been turned over the outer flange of the cap..

In the construction shown in Figures 1 and 2, the closing'cap comprises two similar discsA, B arranged back to back, each furnished with a' circumferential flange A B respectively. The capso formed is inserted into the open upper endof a container G- of treated paper which may be cylindrical or tapered as shown. The container shownin Figure 2 has an internalshoulder O which is engaged bytheedge of the flange A when the cap is inserted, the vessel being sealed after the cap has been inserted by turning or crimping over the upperredge C of the container upon the flange B as shown on the lefthand side of Figure 2.

The cap shown in Figure 3 is similar to that already illustrated in Figure l, but in this case the container D is provided with a circumferential groove or rib l) forming an internal beading tending to expand or separate the circumferential flanges A B of the cap. This beading may be formed in the vessel before the cap is applied or after the cap has been inserted and whilst'the upper end I) of the container is being turned over into the position shown on the lefthand side of Figure 3. Alternatively, the groove D" may be partially formed before insertion of the cap and increased, in depth during the sealing operation by downward pressure brought to bear upon the upper edge.

In the construction shown in Figure 4, areinforcing disc E is interposed between the two flanged discs A B so as to afford a stiffer or stronger closure, and in addition the skirt or flange B of the lower disc B is of in creased depth so that when the outeredge F 2 of the container F is turned over as shown on the lefthand side of Figure 4, the flange B is turned over with it to form a double crimp, In this case the groove or beading F is conveniently provided to position the cap when it is inserted and to reduce the internal diameter of the vessel approximately in the plane of the disc portion A after the vessel has been reversed.

The cap illustrated in Figures 5 and6. differs from that above described in that the disc portion G is formed integral with both the upper flange G and the lower flangeG the upper flange being of double thickness as shown and thus tending to spring outwards and closely engage the inner wall of the container H. As before, this container preferably has a groove or heading H. to position the cap and to reduce the" internal diameter of the vessel ator just above the plane of the disc G, and the lower skirt or flange G may be of the depth shown so as to be embraced by the upper edge H? of the vessel when it is turned over, or. this skirt may be of increased depth so thata double crimp is obtained when the edge of the vessel is turned over as in the arrangement illustrated in Figure 4.. i w

In all cases the vessel and the cap are treatedtwith paraffin wax or otherwise rendered waterproof before the vessel is filled and before the cap is inserted and'seale'd.

The closed or narrow end of the container may be formed in any approved mannerand with or without a tag to facilitate opening.-

' Although a container according tothis invention is particularly adaptedto hold milk or some fluidwhich can readily be poured, the invention is not limited to such use and any suitable paper, paper substitute or the like treated with wax or other waterproofing composition may be employed without departing from the invention.

What I claim as my invention and desire to secure by Letters Patent is 1. A carton comprising an elongated container of curved cross-section of waterproof paper material and a closing cap also of paper material adapted to be inserted into the open mouth of the container and comprising a disc-like body portion, a circumferential flange extending above the central plane of the body portion of the disc closure member and a circumferential flange extending below said plane, the container having an integral internally projecting annular bead formed in the wall of said container approximately in said central plane leaving a skirt 0n the container extending from the bead to the rim of the mouth of the container, said skirt adapted to be folded over the circumferential flange which extends above the central plane of the body portion of the cap.

2. A carton comprising an elongated container of curved cross-section of waterproof paper material and a closing cap also of paper material adapted to be inserted into the open mouth of the container and comprising two circumferentially flanged paper discs secured back to back and thereby forming a disc-like body portion having a circumferential flange extending above the central plane of the body portion and a circumferential flange extending below said plane, the container having an internally projecting annular bead formed in its wall approximately in said plane leaving a skirt on the container extending from the bead to the rim of the container mouth, said skirt being adaptedto be folded over the circumferential flange which extends above the centralplane of the body portion of the cap.

3. A carton comprising an elongated container of curved cross-section of waterproof paper material and a closing cap also of paper material adapted to be inserted into the open mouth of the container and comprising a stiffening disc, a circumferentially flanged paper disc having that surface remote from the flange secured to one surface of the stiffening disc, a circumferentially flanged disc similarly secured to the other surface of the stiffening disc to provide a cap having a disclike body portion with a circumferential flange extending above the central plane of the body portion and another circumferential flange extending below the said plane, the

container having an internally projecting annular bead formed in its wall approximately in said central plane of the cap leaving a skirt adapted to be folded over the-circum- H ferential flange extending above the central plane.

4. A carton comprising an elongated container of curved cross-section of waterproof paper material and a closing cap also of paper material adapted to be inserted into the open mouth of the container and comprising two circumferentially flanged paper discs secured back to back and thereby forming a disc-like body portion having acircumferential flange extending above the central plane of the body portion and a circumferential flange extending below the. said plane with an annular recess between the upper and lower flanges, the container having an internally projecting annular bead formed in its wall and engaging said annular recess, leaving a skirt on the container extending from the bead to the rim of the container month, said skirt being adapted to be folded over the circumferential flange which extends above the central plane of the body portion of the cap.

5. A carton comprising an elongated container of curved cross-section of waterproof pap er material and a closing cap also of paper material adapted to be inserted into the open mouth of the container and comprising a stiffening disc, a circumferentially flanged paper disc having that surface remote from the flange secured to one surface of the stiflening disc, a circumferentially flanged paper disc similarly secured to the other surface of the stiffening disc to provide a cap having a disc-like body portion with a circumferential flange extending above the central plane of the body and another circumferential flange extending below said plane with an annular recess between said circumferential flanges, the container having an internally projecting annular bead formed in its wall and engaging said annular recess leavin a skirt adapted to be folded over the clrcumferential flange extending above the central plane.

In testimony whereof I have signed my name to this specification.

WILLIAM EDMUND JACOBS CROSSBY. 

